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BMC Kaius 01 TWO vs Ridley Grifn RS Ultegra Di2

Both are close enough that people cross-shop them at a similar price. Here is what actually separates them.

The short answer

These two score within 1 point of each other for a typical all-round rider, so there is no single winner — the right one depends entirely on which of the differences below you care about.

BMC

Kaius 01 TWO

70% for a typical rider

£7,299 at Brand website
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Ridley

Grifn RS Ultegra Di2

69% for a typical rider

£7,499 at Brand website
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What actually separates them

Price
The BMC Kaius 01 TWO is £200 cheaper — £7,299 against £7,499.
Weight
The BMC Kaius 01 TWO is 0.6kg lighter, which you notice on long climbs more than anywhere else.
Riding position
The Ridley Grifn RS Ultegra Di2 sits you more upright (1.50 stack-to-reach against 1.45). The BMC Kaius 01 TWO is the more aggressive of the two — quicker if you can hold it, harder work if you cannot.
Tyre clearance
The BMC Kaius 01 TWO takes 52mm tyres against 38mm — the single most common thing buyers wish they had more of.
Climbing gear
The BMC Kaius 01 TWO has the easier bottom gear (25 gear inches against 32), which matters more than weight on anything genuinely steep.
Mudguards
Only the Ridley Grifn RS Ultegra Di2 takes mudguards, which decides whether it can be your winter bike.

Side by side

Spec Kaius 01 TWO Grifn RS Ultegra Di2
Price £7,299 £7,499
Weight 7.8 kg 8.4 kg
Frame carbon carbon
Groupset SRAM Force XPLR AXS 1x13 electronic Shimano Ultegra R8100 Di2 2x12
Stack / reach 1.45 1.50
Tyre clearance 52 mm 38 mm
Lowest gear 25 in 32 in
Mudguard mounts No Yes
Comfort 66 64
Speed 57 56
Climbing 81 56
Value 0 0

Neither might be the right answer

This page assumes an average rider. Tell us how you actually ride and we will rank these two against everything else at the price.

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